from datetime import datetime
from flask import Flask, render_template, session, redirect, url_for, flash
from flask_bootstrap import Bootstrap
from flask_moment import Moment
#FORM
from flask.ext.wtf import Form
from wtforms import SubmitField, StringField
from wtforms.validators import DataRequired

class NameForm(Form):
    name = StringField('what is you name!', validators=[DataRequired()])
    submit = SubmitField('Submit')



app = Flask(__name__)
app.config['SECRET_KEY'] = 'liujw'
bootstrap = Bootstrap(app)
moment = Moment(app)


@app.errorhandler(404)
def page_not_found(e):
    return render_template('404-db.html', current_time = datetime.utcnow()), 404


@app.errorhandler(500)
def internal_server_error(e):
    return render_template('500-db.html', current_time = datetime.utcnow()), 500


@app.route('/')
def index():
    return render_template('index-db.html',
                           current_time=datetime.utcnow())

@app.route('/form', methods=['GET', 'POST'])
def fform():
    #name = None
    form = NameForm()
    if form.validate_on_submit():
        session['name'] = form.name.data
        return redirect(url_for('fform'))
    #   name = form.name.data
    #   form.name.data = ""
    return render_template('fform-db.html', form=form,
                           name=session.get('name'),
                           current_time = datetime.utcnow()
                           )

@app.route('/flash', methods=['GET', 'POST'])
def flash1():
    form = NameForm()
    if form.validate_on_submit():
        old_name = session.get('name')
        if old_name is not None and old_name != form.name.data:
            flash('OPS!you have change you name')
        session['name'] = form.name.data
        return redirect(url_for('flash1'))
    return render_template('fform-db.html', form=form,
                           name=session.get('name'),
                           current_time = datetime.utcnow()
                           )



@app.route('/user/<name>')
def user(name):
    return render_template('user-db.html',
                           current_time=datetime.utcnow(), name=name)


if __name__ == "__main__":
    app.run(debug=True)